Tire gauge



May 22, 1928. 1,670,685

. E. S. MARKS TIRE GAUGE Filed June 18, 1925 l 13 .1 I j I I v I 4 lllllllllylllllllllll r? i INVENTOR.

ATTORNEYS.

Patented May 22, 1928.

EDWARD s. MARKS, or SYRACUSE, NEW YORK. I

TIRE GAUGE.

Application filed J'une 18, 1925-. SeriaiNo. 37,892.

This invention relatesto tire gauges, and

has for its object a tire gauge which willindicate the pressure within the tire by being pressed against theouter wall of the tire.

This invention consists inthe novel features and in the combinations and constructions' hereinafter'set forth and claimed.

In describing this invention reference is 19 had to the accompanying drawings in which like characters-designatecorresponding parts in all'thevi-ews'.

Figure l is a side elevationof this tire auge, showing it as initially applied-to the tire, before being pressed against the tire.

Figure?) is a view' simila r to. Fig-.1, showing' it as being pressed to the tire, the reading is taken. 1 Figure 3" is a longitudinal sectional view otthis tire gauge;

Figure l is a transverse sectional View on line H, Fig. 3.

This tiregauge comprises pressure members, and means for supporting and press- 95 ing them against the tire, said members being movable as a unit relatively to said means, and also relatively toeach other, and means dependent upon the movement" of said members as a unit before the relative movement'- betweenthem is limited, for indicating the pressure of the tire.

As here illustrated this gauge comprises abody or handle a. pressure member slidably mounted relatively to the handle, a second before 85 pressure member slid'abl'y mounted relaj V and 6 will move as .annit'thus sliding the member 13 along: the calibrations on the tively to theformer member, both members being arranged toengage the tire, and one being of greater area, that is, having a pres sure face of greater area than the other, a spring interposed between said members, a spring interposed between the handle and the first member, and means for indicating the movement of the first member relatively to the handle.

1 designates the handle or body which is in the form of a rod or stem formed with a suitable knob 2 by means of which the gauge can be conveniently pressed against the side wall of a tire 3 4 is one of the pressure members it being here shown as tubular in form, and as telescopically -or slidably mounted upon the body 1, the member 4 having a stem 5 at its outer end. I

6 is the second pressure member slidably mounted on the stem 5, and having its outer or pressure face flush. with the end of the stem, orarran'ged'to bear on the tire around the-end of the stem.v i 7 is a spring interposed between thehandie 1 and the pressure member 4,, in the tubular portion ofthe handle 1.

Sis aspring'inte'rposed betweenthe members 4 and 6, normally holding them spaced;

apart. The member 4. issecuredfagainst detachmentfrom the handle 1 by a pin 9 on the handle and extendingv into a lengthwise slot 10 in thermember 4:, and the member 6 is similarly connected by a pin and slot 11t-o the stem 5.

An indicator 1 3 is slidably mounted on the handlel along calibrations 14 onxthe handle 1, this .5 indicator 13 being actuated by the sliding of the member 4:: along the handle 1.

In operation the gauge is pressed against the'side wall of the tire with the face of the member; 6a-nd the endzof the stem 5 en gaging the tire. As the pressureis applied to the knob 2, the spring-7 is compressed and the force thereof applied to the member 4, pressing the stem 5 into the side wall of thetire asshownin Fig. 2, and also through the springS: pressing the member .6 which has: a greater area thanthe stem- 5.against the tire so that it makes'avdepression'in the tire. The pressure is applied untilxthe member 6 is compressed against thespring 8 to close the gap between. the members a and 6. Beiore this gap closes both members 4 handle 1, and during such movement the gap between the members 4 and 6 is gradually being taken up. WVhen this gap is closed the operator discontinues pressing the instrument against the tire and removes the tire gauge from thetire, so that the spring reacts, but leaves the indicator where it has been pushed when pressed against the tire. A reading may be taken on the calibrations. The operation of the gauge depends upon the amount of bodily movement of the two pressure members as a unit during the time that the gap is being closed between them.

This gauge is particularly advantageous when used with balloon tires, as a car owner is naturallydisinclined to take the pressure of his tires or to postpone the task, owing to the facts that the caps, etc-., on the valve stems must be remove ,By my gauge he can instantly determine by pressing the gauge against the tire whether or not the tires need more air, and having once determined that the tires do need air, will fill the tires with air at the nearest station.

What I claim is 1. In a tire gauge, a body, a member slidable on the body, and having an engaging end for pressing against the tire, a spring interposed between the body and said member for resisting the relative sliding movement of the body and the member, a second member arranged to press against the-tire and being movable relatively to the first member, a spring interposed between the members for resisting relative movement of said members, and means for indicating the amount of relative movement of the body and said members.

2.1 11 a tire gauge, the combination of two members arranged to engage the tire and having movement relatively to each other, and a spring interposed between said members for resisting such movement, a handle, a spring interposed between the handle and one of said members, and indicator means actuated by the movement of said members relatively to each other and the handle.

3. In a tire gauge, the combination of three parts arranged in axial alinement, said parts comprising a handle, a pressure member slidable on the handle, and a second pressure member slidable on the first pressure member, a spring interposed between said members, and a spring interosed between the handle and the first memer, means for indicating the amount of' relative movement of the handle and the first member when the gap between said members is closed, during the relative movement of said members.

posed between said members, and an indi cator operated by the movcment of the first member along the handle, when the space between said members is taken up. 5. A. t1re gauge for taking the pressure of the tire by thrusting it against the tire, comprising two members of different area arranged to be compressed into thetirc, and indicator means operated by the movement ofsaid members as, av unit, and'the movements of said members relatively to each other.

6. A tire gauge, comprising a body, pressure members arranged-to press into the tire andmount'ed to move relatively to the body as a unit and relatively to each other, a springbetween the body and one of the members, and means for indicating the relative movement of the body and said mem bers when the relative movement between said members is limited. 1- y 7. A tire gauge, comprising two. concentrically arranged members having pressure faces of difierent areas, one member being slidable relatively to the other, and a spring for resisting such sliding movement, a handle on which the other member slides, and a spring for resisting relative sliding movement of the handle and the member slidable thereon, and indicator means operated by the movement of said'members rielatively to each other and the handle.

8. A tire gauge, comprising members for coacting with the walls of atire to indent dilferent distances into the same and pressure indicating means operable by the movement of said members while indenting the tire wall. v

In testimony whereof, I have hereunto signed my name,at Syracuse, in the county of Onondaga, and Sta e 0 w York, this 26th day of May, 1925. v EDWARD S. MARKS. 

